*{
    margin: 0;
    padding: 0;
}
#header #icon{
    background-image: url(icons.png);
    width: 16px;
    height: 16px;
    background-position: -26px -216px;
    border-radius: 8px;
    background-color: gray;
    margin-right: 5px;
    margin-top: 6px;
    /* display: block;
    float: left; */
}
#header .align div{
    float: left;
    font-size: 12px;
    color: white;
}
#header{
    background-color: black;
    height: 30px;
    /* text-align: right; */
    line-height: 30px;
}
.align{
    float: right;
    margin-right: 10px;
}
.arrow{
    border-top: 1px solid white;
    border-left: 1px solid white;
    width: 3px;
    height: 3px;
    /* float: left; */
    transform: rotate(225deg);
    margin-top: 12px;
    margin-left: 5px;
}
#nav{
    height: 67px;
    border-bottom: 1px solid #e5e5e5;
    background-color: #e5e5e5;
}
#nav .nav1{
    width: 800px;
    background-color: #e5e5e5;
    margin: 0 auto;
    height: 67px;
}
.navleft{
    float: left;
}
.navright{
    float: right;
}
.navleft h2{
    line-height: 67px;
    height: 67px;
}
.navleft h2 span{
    font-size: 16px;
    font-weight: normal;
    color: green;
}
.navright ul{
    /* float: left;
    margin-left: 8px;
    height: 67px;
    list-style: 67px; */
    list-style-type: none;
}
.navright ul li{
    float: left;
    margin-left: 8px;
    height: 30px;
    line-height: 30px;
    margin-top: 20px;
}
.selected{
    color: white;
    background-color: gray;
    border-radius: 3px;

}
.navright ul, .navright div{
    float: left;
    /* height: 67px;
    line-height: 67px; */
    margin-left: 10px;
}
#ttt{
    width: 70px;
    text-align: center;
    border-radius: 0.1px;
    /* border: 1ex solid gray; */
    height: 20px;
    line-height: 20px;
    /* font-size: 16px; */
    border: 0.4ex solid gray;
    margin-top: 20px;
}
#content{
    width:700px;
    margin: 0 auto;
    height: 1000px;
    background-color: yellow;
}
.answer .first{
    background-color: #e5e5e5;
    height: 50px;
    line-height: 50px;
}
.answer .first span{
    font-size: 20px;
    color:blue;
    margin-left: 10px;
    margin-right: 10px;
}
.second{
    background-color: #e5e5e5;
    width:300px;
    vertical-align: middle;
}